| Author |
Message |
GS438
Joined: 25 Jul 2012
Posts: 11
|
| Posted: Wed Jul 25, 2012 9:56 pm Post subject: PRO 900 GOES DARK |
|
|
Hi everyone new to the board. I have two Zenith Pro 900 projectors and both have just started with the kinda the same problem . Both pictures are very dark you have to turn the sharpness way up to see anything. The one we use everyday stays dark and nothing changes we turn the sharpness way up to see anything but then the picture is just washed out. The one in our theater room starts out fine but then all of a sudden the picture will just go real dark but after about 10 minutes it comes back then it may stay good for the rest of the movie or go dark. theres no telling when its going to happen . Should I be looking at the RGB BOARDS? And if they are bad can they be fixed.
Thanx Mario
|
|
| Back to top |
|
 |
Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
|
| Posted: Wed Jul 25, 2012 10:55 pm Post subject: |
|
|
you turn the SHARPNESS up?
On both, see if the brightness and contrast controls have any affect at all. I suspect that at least the one that's permanently dark has one or the other control that does absolutely nothing. If so, then yes, it's the main RGB board that's bad. I can repair them, and unless you have a scope and a meter, it's not something typically that even a good solderer will be able to troubleshoot and repair. The other one may be the same problem, but I'm surprised that it's intermittent.
I used to charge $250 a board to repair them, but could do both for $300 incl return shipping, assuming the second one has the same issue.
Cheers!
|
|
| Back to top |
|
|
GS438
Joined: 25 Jul 2012
Posts: 11
|
| Posted: Thu Jul 26, 2012 2:53 am Post subject: |
|
|
| Curt Palme wrote: | you turn the SHARPNESS up?
On both, see if the brightness and contrast controls have any affect at all. I suspect that at least the one that's permanently dark has one or the other control that does absolutely nothing. If so, then yes, it's the main RGB board that's bad. I can repair them, and unless you have a scope and a meter, it's not something typically that even a good solderer will be able to troubleshoot and repair. The other one may be the same problem, but I'm surprised that it's intermittent.
I used to charge $250 a board to repair them, but could do both for $300 incl return shipping, assuming the second one has the same issue.
Cheers! |
Thanx Curt!
Yes I do turn the sharpness up an it makes it so you can see the picture but it's all washed out . I had to do that to both . Like i said the theater projector went dark but came back for awhile. I Will start taking them down and getting the boards out . Where do I send them?
|
|
| Back to top |
|
|
Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
|
|
| Back to top |
|
|
gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
|
| Posted: Thu Jul 26, 2012 6:58 am Post subject: |
|
|
The "sharpness" is a thing which only appears (and only has effect) when you use composite or s-video input, have you tried feeding it with an RGBHV cable from a computer?
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
|
|
| Back to top |
|
|
draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
|
| Posted: Thu Jul 26, 2012 3:22 pm Post subject: |
|
|
always shocoked to see people still running composite or S cabvle , 480i VCR quality video. You just want to run over there with an RGB cable and show them what they're missing 
|
|
| Back to top |
|
|
|
|
